how much is this sega master system worth.......I bought it for 20 and had some guy tell me when I was leaving the flea market he would give me 25 for it.....I said nah and then real quick he went to 50.......I thought I paid almost too much at 20 but I don't know much about the sega master system but it is fun to play.....here are some pics......I am thinking about selling it but was not sure what a good price for it would be......any help would be great appreciated